下列物质中,前一种是单质,后一种是混合物的是( ) A.红磷、冰、水混合 B.水

题型:选择题

问题:

下列物质中,前一种是单质,后一种是混合物的是(  )

A.红磷、冰、水混合

B.水、水煤气

C.水银、天燃气

D.二氧化碳、含氧20%的CuO

考点:单质和化合物纯净物和混合物
题型:选择题

Reading comprehension. (阅读短文 ,判断正“√“×” 。 )    

   Grandma Wang is very old now. She has no child. She lives with her pet cat. Last Sunday some children visited Grandma Wang. They wanted to do something for her. Tom cleaned the windows. Amy washed

the clothes. Lingling made a big cake. They worked very hard.     At lunch time,they were very tired and

very hungry. They ate the cake. Grandma Wang was very happy.

( )1. Grandma Wang has three children.

(    ) 2. Last Sunday, some children visited Grandma Wang.

( )3. Amy cleaned the windows.

( )4. They ate the cake for lunch.

( )5. Lingling washed the clothes.

题型:选择题

遗传性球形红细胞增多症诊断依据()

A.贫血、黄疸、肝脾大

B.红细胞渗透脆性降低

C.球形红细胞增多

D.Coombs是试验阳性

E.红细胞渗透性增高

题型:选择题

样品在放置期间,待测组分浓度的影响因素是()。

A.生物因素

B.化学因素

C.生物、化学和物理因素

D.生物和物理因素

E.物理因素

题型:选择题

心理咨询的目标之一就是促使行为变化。

题型:选择题

康明斯ISBe发动机减速缓慢的原因有()。

A、油门踏板回位慢

B、油门踏板传感器发生故障

C、电子控制模块(ECM)故障

D、喷油器电磁阀电路发生故障

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